NT Sports Therapy

11/08/2026

Movement Variability: A Hallmark of Healthy Human Movement

Movement variability is not simply “poor technique” or random error. According to Mukherjee and Yentes (2018), movement fluctuations reflect a healthy system’s ability to adapt to changing environmental constraints. However, both too little and too much variability may be linked with injury risk or altered neuromuscular control.

Stergiou, Yu and Kyvelidou (2013) define human movement variability as the natural variations seen across repeated performances of the same task, explaining that even elite performers do not reproduce identical movement patterns every time. This supports Bernstein’s idea of “repetition without repetition”, where healthy movement contains flexible neuromotor solutions rather than robotic repetition.

This does not mean more variability is always better. Stergiou, Yu and Kyvelidou (2013) describe an optimal variability model, where healthy systems sit between excessive rigidity and excessive randomness. In rehabilitation, the aim should not be to remove all variation, but to restore adaptable movement that can respond to fatigue, speed, load, terrain, pain, and sporting demands without losing control.

09/08/2026

Arthrogenic Muscle Inhibition: Why Muscles Stop Working After Joint Injury

Arthrogenic muscle inhibition is a neurological response where a muscle fails to fully activate after joint injury, even when the muscle itself is not directly damaged. According to Sonnery-Cottet et al. (2022), AMI commonly occurs after knee injury or surgery and involves quadriceps activation failure caused by neural inhibition; clinically, it may present as poor vastus medialis obliquus activation, extension deficit, hamstring contracture, or chronic stiffness.

Norte, Rush and Sherman (2021) explain that AMI can create a “disconnect” between what the patient wants to do and what the muscle can produce, because otherwise healthy muscle becomes reflexively inhibited after joint trauma. This is not simply weakness from laziness, poor effort, or lack of strength training; it reflects altered neural signalling from the injured joint, including changes linked with pain, effusion, inflammation, joint laxity, and disrupted mechanoreceptor input.

This matters because untreated AMI can limit rehabilitation progress. Norte, Rush and Sherman (2021) report that joint injury is associated with reduced motor neuron availability, central activation failure, lower spinal-reflexive excitability, and altered sensory input to the spinal cord and brain. Therefore, rehabilitation should not only strengthen the muscle but also address pain, swelling, inflammation, activation failure, neuromuscular control, and progressive loading so the nervous system can restore effective voluntary recruitment.

07/08/2026

06/08/2026

Rate of Force Development: An Underestimated Factor in Athletic Performance and Injury Prevention

Rate of force development refers to how quickly force can be produced during the early phase of contraction, not simply how much force can eventually be produced. According to Maffiuletti et al. (2016), RFD is increasingly used to characterise explosive strength in athletes, patients, and older adults because it may relate more closely than maximal strength to sport-specific and functional tasks.

Levernier and Laffaye (2017) explain that explosive force is particularly important in climbing because athletes often have very little time to grip strongly during dynamic movements. Their study found that RFD at 200 ms and RFD at 95% of maximal force were reliable and able to discriminate between international climbers, skilled climbers, and non-climbers, suggesting that RFD can be useful for monitoring training adaptations.

This does not mean RFD replaces maximal strength. More accurately, performance and injury prevention require both force capacity and speed of force expression. Maffiuletti et al. (2016) highlight that early RFD is strongly influenced by neural factors such as rapid muscle activation and motor unit discharge rate, while later RFD becomes more influenced by muscular and contractile properties. Therefore, rehabilitation and performance training should include controlled explosive intent, rapid stabilisation drills, plyometric progressions, and sport-specific force production, not only slow strength work.

04/08/2026

Motor Learning Principles in Modern Physiotherapy Rehabilitation

Motor learning is central to modern physiotherapy because rehabilitation should not only improve movement during a session, but also create lasting changes in how a person controls movement. According to Leech et al. (2022), motor learning is now understood as sustained change in motor behaviour, supported by several mechanisms including use-dependent, instructive, reinforcement, and sensorimotor adaptation-based learning.

McLoughlin (2020) explains that movement training should be guided by principles such as feedback, error-based learning, reward, cognitive planning, practice variability, biomechanics, physical capacity, attention, and self-efficacy. This means rehabilitation is not just about repeating exercises; it is about designing practice so the patient can solve movement problems, adapt to different contexts, and transfer improved movement into real life.

This has important clinical implications. Leech et al. (2022) highlight that different learning mechanisms can be targeted through different rehabilitation strategies: repeated task-specific practice supports use-dependent learning, external performance feedback supports instructive learning, successful task outcomes support reinforcement learning, and exposure to changing movement conditions supports sensorimotor adaptation. Therefore, effective physiotherapy should combine repetition, feedback, variability, patient engagement, and progressive challenge rather than relying on isolated strengthening or passive correction alone.

02/08/2026

Neuromuscular Control Deficits Following Musculoskeletal Injury

Neuromuscular control deficits can persist even when an athlete appears clinically recovered and has returned to sport. According to Howell, Lynall, Buckley and Herman (2018), residual motor-control impairments may remain after concussion despite symptom resolution, particularly during gait and dual-task conditions, and these deficits may help explain why subsequent musculoskeletal injury risk appears increased after return to play.

Following ACL reconstruction, similar concerns apply to musculoskeletal injury rehabilitation. Skandalis et al. (2026) found that elite handball players continued to demonstrate quadriceps and hamstring strength deficits, H/Q ratio asymmetries, and reduced functional knee status for up to 24 months after return to play. Their findings suggest that athletes may return to high-level competition before full neuromuscular recovery has occurred.

This does not mean every athlete with a neuromuscular deficit will be reinjured. More accurately, poor strength symmetry, reduced dynamic control, impaired proprioception, fatigue, and incomplete sport-specific rehabilitation may reduce the body’s ability to control high-speed landings, cutting, deceleration, and contact demands. Skandalis et al. (2026) reported a 35.3% ACL reinjury rate over two years, with most reinjuries occurring early after return to play, supporting the need for ongoing objective monitoring rather than clearance based only on time or symptom reduction.

29/07/2026

The Influence of Sensorimotor Dysfunction on Joint Stability

Joint stability is not controlled by ligaments alone. According to Clark (2024), functional joint stability depends on the coordinated interaction between static restraints, such as capsule and ligaments, and dynamic restraints, such as muscles that control joint alignment during movement. When sensorimotor control is impaired, the joint may struggle to resist excessive displacement and return toward neutral alignment during loading.

Myers, Wassinger and Lephart (2006) explain that the sensorimotor system includes proprioception, joint position sense, kinaesthesia, force sense, central processing, and neuromuscular control. Following injury, mechanical structures may be damaged, but the sensory feedback from mechanoreceptors can also be disrupted, reducing the nervous system’s ability to coordinate protective muscle activation around the joint.

This is clinically important because poor joint stability can persist even when strength appears adequate. Clark (2024) describes how joint injury may trigger an articuloneuromuscular cascade involving impaired proprioception, altered CNS processing, impaired feedforward and feedback neuromuscular control, reduced muscle performance, and functional joint instability. Therefore, rehabilitation should not only restore strength, but also retrain proprioception, reactive control, preparatory muscle activation, balance, co-contraction, and task-specific movement control.

29/07/2026

At NT Sports Therapy, we recognise that tension can be the body’s way of asking for support. We’re pleased to share this thoughtful message from Ribble Therapy

27/07/2026

Load Capacity vs Load Tolerance: Understanding the Difference in Rehabilitation

Load capacity refers to the tissue’s physical ability to withstand stress without breaking down. In contrast, load tolerance reflects how much loading the person can currently tolerate without unacceptable pain, flare-up, fatigue, or loss of movement quality. According to Reiman and Lorenz (2011), rehabilitation should progress from early protection and symptom control toward strength, power, endurance, metabolic conditioning, and sport-specific function, meaning tissue recovery requires structured progression rather than simple rest.

Norris (2017) explains that tissue capacity is influenced by how much load a structure can accept before symptoms or breakdown occur, and that both excessive loading and prolonged under-loading can disturb tissue homeostasis. This is clinically important because a tissue may have reduced capacity after injury, while the person’s tolerance may be even lower due to pain, fear, fatigue, inflammation, or poor recovery.

This distinction changes rehabilitation planning. Norris (2017) describes the aim of rehabilitation as increasing the capacity of the injured tissue through progressive overload, specificity, and load monitoring, while avoiding sudden spikes that exceed the person’s current ability to adapt. Therefore, treatment should not only ask, “How strong is the tissue?” but also, “How much load can this person tolerate today, recover from tomorrow, and progressively build over time?”

25/07/2026

Muscle Synergy Dysfunction: When Strength Exists but Movement Control Fails

Muscle synergy dysfunction occurs when strength exists, but Movement Control Fails to produce efficient movement, rather than each muscle working in isolation. According to Ting and McKay (2007), muscle synergies help explain how the nervous system manages complex movement by organising multiple muscles into functional patterns for posture and movement control.

Safavynia, Torres-Oviedo and Ting (2011) explain that clinical tests often focus on visible outcomes such as walking speed, balance scores, or task completion, but similar movement outcomes can be produced through very different muscle coordination strategies. This means a person may appear strong during isolated testing, yet still fail to organise muscles effectively during dynamic tasks such as walking, landing, reaching, or changing direction.

This is why strength alone does not always equal movement control. Safavynia, Torres-Oviedo and Ting (2011) describe muscle synergies as motor modules that allow the nervous system to combine muscles for biomechanical subtasks such as stabilisation, propulsion, swing initiation, and limb deceleration. When these patterns are poorly timed, merged, or insufficiently adaptable, movement can become inefficient even when individual muscles have reasonable force capacity.

Clinically, this means rehabilitation should not only ask whether a muscle is “strong”, but whether it contributes at the right time, in the right sequence, and in the right relationship with other muscles. Treatment may therefore need to include task-specific control, balance work, gait retraining, coordination drills, perturbation training, and progressive exposure to real movement demands.